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. 2013 Oct 9;14:216. doi: 10.1186/1471-2369-14-216

Figure 3.

Figure 3

Analyses of calcium balance over the study period. A) Intra-dialytic change in plasma ionized calcium levels at each sampling occasion when using citrate dialysis fluid compared to control. B) Intra-dialytic change in plasma PTH levels at each sampling occasion when using citrate dialysis fluid compared to control. Black bars represent pre-dialysis values and white bars post-dialysis values. Bars show means and error bars represent SEM, n = 20. * = p < 0.05, ** = p < 0.01 and *** = p < 0.001 and ** = p < 0.01.